While.Condition 属性

定义

命名空间:

System.Activities.Statements

程序集:

System.Activities.dll

要在 While 循环每次迭代之前执行的 Activity<TResult>。

public:
 property System::Activities::Activity<bool> ^ Condition { System::Activities::Activity<bool> ^ get(); void set(System::Activities::Activity<bool> ^ value); };

[System.Windows.Markup.DependsOn("Variables")]
public System.Activities.Activity<bool> Condition { get; set; }

[<System.Windows.Markup.DependsOn("Variables")>]
member this.Condition : System.Activities.Activity<bool> with get, set

Public Property Condition As Activity(Of Boolean)

属性值

Activity<Boolean>

条件。

属性

DependsOnAttribute

示例

下面的代码示例演示如何设置 While 活动的 Condition 属性。

new While
{
    Condition = true,
    Body = new Receive
    {
        ServiceContractName = Constants.POContractName,
        OperationName = Constants.UpdatePOName,
        CorrelatesWith = poidHandle, // identifies that the UpdatePO operation is waiting on the PurchaseOrderId that was used to initialize this handle
        CorrelatesOn = new MessageQuerySet // the query that is used on an incoming message to find the requisite PurchaseOrderId specified in the correlation
        {
            // Id is the name of the incoming parameter within the PurchaseOrder
            { "PoId", new XPathMessageQuery("sm:body()/defns:PurchaseOrder/defns:Id", Constants.XPathMessageContext) }
        },
        Content = ReceiveContent.Create(new OutArgument<PurchaseOrder>(po)) // creates a ReceiveMessageContent
    }
},